Lens-grinding machinery



April 27 1926. 1,582,515}

W. G. DOLEY LENS GRINDING MACHINERY Filed April 1922 E a-nmuamm v Patented Apr. 27, 1926 ijl il its .lilii WILLIAM GEORGE DOLEY, OF TORRENSVILLE, SOUTH AUSTRALIA, AUSTRALIA.

LENS-GRINDING- MACHINERY.

Application filed April 5, 1322.

To all whom it may concern:

Be it known that I, TVVILLIAM Gnonen Donny, a subject of His Majesty the King of Great Britain, and resident of 57 West Street, Torrensville, in the State of South Australia, Commonwealth of Australia,

have invented certain new and useful Improvements in and Connected with Lens-Grinding Machinery, of which the following is a specification.

My invention relates to lens grinding inachinery and comprises an improved arrangement of mechanism to impart to a lens holder two reciprocating movements at right angles to one another causing the lens to be, moved over the surface of the lapping tool, a stationary lapping tool being used for cylindrical and toric sections and a revolving lapping tool for spherical, hyperbolic or parabolic sections and the like.

According to this invention several units or heads may be driven from the one driving point, each unit being self contained and adapted to be controlled independently without in any way interfering with the operation of the other units.

Each unit of my lens grinding machinery is housed in a boX containing oil and provided with an oil pump and distributing pipes. Two shafts pass through the box from side to side, these shafts are driven at different speeds according to the desired ratio of the reciprocating movements to be imparted tothe lens holder. One of the shafts carries an eccentric block which is adapted to impart a quick rocking motion to a carriage pivoted upon a guide bar near the bottom of the casing while the other shaft also carries an eccentric block that imparts a reciprocal sideways and slower movement to the same carriage. The carriage supports a hinged carrier for the lens holder which is thus moved by the carriage and is held upon the lapping tool by adjustable spring devices.

The eccentric blocks are each provided with a clutch, the two clutches being c011- nected by a yoke and controlled from a lever on the outside of the casing. But in order that my invention may be more clearly understood I will now describe the same by the aid of the accompanying illustrative drawings wherein:

Fig. 1 is a plan of a unit of my lens grinding machinery.

Fig. 2 is a section on line :c-y of Fig. 1.

Serial No. 549,671.

Fig. 8 is a front elevation with part of case removed and with some of the parts at the rear omitted for clearness.

Fig. lis a front view of casing. 69

F 5 is a side sectional elevation of carriage.

Fig. 6 is a plan of the bell crank.

Fig. 7 is a side elevation thereof. I

Fig. 8 is a perspective view of bearing shoe for the bell crank.

Fig. 9 is a section of one of the bearings of the guide shaft.

In each of the illustrations similar letters of reference are used to denote similar or 79 corresponding parts wherever they occur.

The oil containing box a is provided with a lid or cover a and has shafts passing through it from side to side and supported in bearings a in the sides of the box.

One shaft 5 carries an eccentric block 0 that is adapted to impart a quick backward and forward rocking motion tothe carriage (Z through its strap 0. The other shaft 6 carries an eccentric block 7 the strap 7 which is adapted to rock a bell crank g.

This bell crank g is mounted on a vertical spindle k and its other arm rests in a shoe j arranged between the cheeks of the carriage (Z so that it imparts a reciprocal sideways movement thereto.

The carriage (Z is mounted on a guide shaft 70 by means of a sleeve d so that it may rock and slide thereon simultaneously while it also slidably rests upon the eccentric block 0. The guide shaft is is supported in slip-in bearings Z on the sides of the box, each of said bearings having an opening Z to receive the end of the shaft is which is cut away at 71: to allow it to freely pass through the opening Z. At'the upper part of the carriage d is a bar m that is hinged to the carriage at m and extends forwardly through an opening it in the front of the box a.

At the front end this bar has two lugs or ears n to which are connected the tension springs 0 the tension of which is controlled by a lever handle 0 and is adjustable by means of nuts 0 The body of the bar at has a hole through it in which is a shaft 29 that is held in position by a collar 29 and is free to oscillate in a rotary manner in the bar m.

The forward end of the shaft 39 supports the lens carrier 9 to which pressure is applied by the hinged bar m. The lapping tool carrier *1 is adjustably supported in guides 2" and is held in position by a clamp nut 2 Vfhen desired the lapping tool may he rotated as will be Well understood.

The eccentric blocks are provided with friction clutches s which are connected by a yoke s that is adapted to be inoy d by a fork 5- on a rod 5- controlled by a lever a on the front of the box.

The shafts Z) and 0 may be driven inclependently as illustrated by belts z or they ma be connected by suit'. JlG gear and driven by a single helt wheel. An oil pump ii is operated by the eoc ntrie to supply oil through pipes tno" shown) to the parts ol the niechan'sin.

,By this means any heads may be coupled up and a. battery oi six or eight heads may he used each d being controlled independently of the ers. n ope 'ation the shatts and the ch t hes heir; ion the eccentric h l also he rotated. The ZLOlltli-Q cause the carriage (Z to he rec... hecln'ardly and forwardly on and simultaneously the eccentri' cause the bell eranl: g to reci carriage sideways.

number of units or and 0 being The e movements cause the earr age to impait to the lens carrier reci 'n-oeal motions at ri 'ht angles to one another, the lens being guided over the surface oi the lappi g1 iol and the required preset re heinp; applied hee;o by the springs 0.

In lens grinding machine y. the ennhination of e. casino. at lined snide shatt therein, a carriagerotntubl and slid. mounted on the guide shsr e 1 hinged to said carriage, a lens holder carrier by said bar, 1110s "for applying; pressure to said lens holder, and means tor imparting! to carriage trco reciprocal morements perpendicihir to each other, said liifl', named ilezins comprising; two independently drircn arallel driyingshafts mounted in said casin an ,ecentrio block on each shaft. :1

carried by the carriage and in operi e engagement with one of 1 l)l()('i-.' i tot i'mltiiigthe carriage on said gi'uiue shaft.

i strap in operative engagement with the er l7l0tl. and a hell i icuh ted ho- ;ieen suit last eamed strap and the carrie e tor sliding said carriage on said o'uidtsha; t. testimony wher 'eol' he has diilflttl his While-.11 GE RGE DOLEY. 

